package kv import ( "path" "reflect" "github.com/abronan/valkeyrie/store" "github.com/containous/traefik/v2/pkg/config/parser" ) // Decode decodes the given KV pairs into the given element. // The operation goes through three stages roughly summarized as: // KV pairs -> tree of untyped nodes // untyped nodes -> nodes augmented with metadata such as kind (inferred from element) // "typed" nodes -> typed element func Decode(pairs []*store.KVPair, element interface{}, rootName string) error { if element == nil { return nil } filters := getRootFieldNames(rootName, element) node, err := DecodeToNode(pairs, rootName, filters...) if err != nil { return err } metaOpts := parser.MetadataOpts{TagName: parser.TagLabel, AllowSliceAsStruct: false} err = parser.AddMetadata(element, node, metaOpts) if err != nil { return err } return parser.Fill(element, node, parser.FillerOpts{AllowSliceAsStruct: false}) } func getRootFieldNames(rootName string, element interface{}) []string { if element == nil { return nil } rootType := reflect.TypeOf(element) return getFieldNames(rootName, rootType) } func getFieldNames(rootName string, rootType reflect.Type) []string { var names []string if rootType.Kind() == reflect.Ptr { rootType = rootType.Elem() } if rootType.Kind() != reflect.Struct { return nil } for i := 0; i < rootType.NumField(); i++ { field := rootType.Field(i) if !parser.IsExported(field) { continue } if field.Anonymous && (field.Type.Kind() == reflect.Ptr && field.Type.Elem().Kind() == reflect.Struct || field.Type.Kind() == reflect.Struct) { names = append(names, getFieldNames(rootName, field.Type)...) continue } names = append(names, path.Join(rootName, field.Name)) } return names }